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1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf1fe29e3044c1daba6e612627d598513dc20f8c8e3905637e11e9c4e708e999. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5c05a07e-9b9f-4d4f-8e38-4b177c626c3d.json and https://artists.proofprofile.net/proofs/artist/5c05a07e-9b9f-4d4f-8e38-4b177c626c3d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a08d8bcec4353a43c791af5145761dbd0aec3dd436b4bf7bacb6469f3b02f85. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWV2081621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x810fade1ffabcf397b8102e8c36b0f6912dfd2ab3ac6c323046d479665eaea4f. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFYX2129374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb26110dad2275b679a0310e58048bca1ffa61f299843699aecc4e38173aa01bd. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZES52163083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30ef9f8feba75d06ec01f63cf018ea01a0bf8329de20030ed51c2019985ea07e. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZES82182875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89b4aa8fa07cc0b5b2fc2be275d88cfe8bc68fcb464307674095b623aca561fa. Chain 2 (Bitcoin): anchored in block 957959 (2026-07-14T05:54:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZES72260113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x033fc416beb6022dfc657634d31045797fe29ff5d881f3204be3b1ccdd90ded5. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6M2223908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29827d44a4f4d1c2834eedbd9145431ae1fd08b93fa3a2d1c8842abd2865c980. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWX2268442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61dcb40cb11ad27bc223cacb60d1674761a61c7887dd8671e65152a7177114aa. Chain 2 (Bitcoin): anchored in block 958635 (2026-07-19T00:58:42Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE5XG2259801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x563c9d272a393ef4a802fdcbf17fe5e33fd7bccc4e9d9b555a04bb535dad2580. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZES92378168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe45c3ff58f150f50687a061e6c5222c3979ad8091fbe99a404fe2ea3a3f8882a. Chain 2 (Bitcoin): anchored in block 957522 (2026-07-11T04:46:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB72358563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x880af04d60cb265fb215adc93e89c6e509dace7a508c198c5062da407c04955e. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMEM2332138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91d6971120c0aa5cc3108fac0b1c853c8d437149af7cdb515249af10b4ed96b4. Chain 2 (Bitcoin): anchored in block 957526 (2026-07-11T06:03:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWZ2321060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a9d6e41892ff7a4f8296a848f207bcf6c22ff6f601c3f6bf60bc3b4b23fc4a0. Chain 2 (Bitcoin): anchored in block 957522 (2026-07-11T04:46:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZDA72486275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x609c565e81c6812afb5074d6128a4ae64b7c3103dea29dbc0e3b641e05720c19. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZDA72486276.